Why are chromosomes not always visible?

a.

They are often very loosely coiled in strands of chromatin

b.

They are wound very tightly

c.

They lose pigment in sunlight

d.

They are often behind the nuclear envelope

Why does a cell need to grow in this way

Hemophilia is a condition in which blood does not clot properly. What is the main effect of this condition?

Which statement is true of virusesWhat information do viral genes contain?

3. In which type of cellular transport are Na and K moved through a cell membrane A. facilitated diffusion B. active transport C. diffusion D. osmos

What type of energy transformation takes place when carbon is cycled during cellular respiration? Chemical energy to chemical energy Chemical energy to electrical energy Mechanical energy to chemical energy Mechanical energy to mechanical energy

What are some of the ways people may want to modify human embryos in the future?

The main prey for the frogs in a certain pond are dragonflies. If the number of dragonflies is greatly reduced because of pesticide usage, how could the frogs adapt in order to survive?

When a male donkey is bred with a female horse, the offspring produced is a mule, which is healthy but sterile. Karyotyping experiments have revealed that horses and donkeys have different numbers of chromosomes, 64 for horses and 62 for donkeys.

If the genotype of both parents was Aa, what would be expected of the genotypes among their possible offspring?

Which of the following best identifies a physical digestive process? enzyme action heat formation peristalsis acid secretion